メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.8812500 36.5958334, 139.8875000 36.5958334, 139.8875000 36.6000000, 139.8812500 36.6000000, 139.8812500 36.5958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral